D.M.
I agree with Joan R- We had the Constable's office out at our local Chick-Fil-A and they had the kits to get all the info, including a lock of hair for DNA. When I asked them about where someone else could get info, they said a lot of times schools will have them come out, etc. But you can also just call them to get what you need.
When we went to the courthouse to take care of transferring a car title, they had the kits there.